Piston



(No Model.)

H. L 'BROWNI PISTON.

l llll Il n l' 111 I rl' Nrrnn Starts rricn,

Partnr HIRAM L. BROIVN, OFVISTULA, ASSIGNOItOF ONE-HALF TO GEORGE N. THOMAS AND ELI ALBRIGH'I, OF GOSHEN, INDIANA.

PISTON.

SPECIFICATION forming part of Letters Patent No. $711,806, dated February 3, 1885. Application filed Jn1y25, 1884. (No model.)

To a/ZZ whom, it may concern.- 4

Be it known that I, HIRAM L. BROWN, a citizen of the United States, and a resident of Vistula, in the county of Elkhart and State of Indiana, have invented certain new and useful Improvements in Pistons; and I do hereby declare that the following is a full, clear, and eXact description ot' the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part ofthis specification, and in whichA Figure l is a top view of my improved pis'- ton for hydraulic presses. Fig. 2 is a verti cal section ot' the same, and Fig. 3 is a perspective view of the several parts constituting the piston.

Similar letters of reference indicate corresponding parts in all the figures.

My invention has relation to that class of pistons in which the packing may be tightened around the periphery ofthe piston; and it consists in the improved construction and combination ot' parts of a piston especially adapted for hydraulic presses in which the packing may be tightened around the entire periphery by turning a cani-disk, as hereinafter more i'ully described and claimed.

In the accompanying drawings, the letter A indicates the body ol' the piston, from the center of which projects a screw-threaded bolt, B, and a cup-shaped packing-disk, of leather or similar material, (shown at 0,) tits with its perforated center upon the said bolt, and has a flange, D, adapted to bear against the side of the cylinder in which the piston travels. A disk, E, haying an annular recess, F, at the edge ot' its face, and having a number ot' radiating recesses, G, ,forming sector-shaped blocks H, upon the face of the disk, fits with its center upon the boltiltting within the cupshapcd leather packing. A number of T; shaped blocks, I, t and slide with their inwardly-pointing arms .I in the radiating recesses, the said arms being of the same thickness as the depth of the recesses, while the outer sides of the segmental cross-heads K of the blocks bear against the inner sides of the flange of the packing-disk, and the said crossheads are thicker than the arms, and are provided upon the inwardly facing shoulders formed by them with ratchet or wedge shaped projections L.

M is a disk having a central perforation fitting upon the central bolt, and the said disk has a number of ratchet-teeth or cam proj ections, N, upon its edge corresponding in number and location to the projections upon the T- shaped blocks,and bearing with their outer edges against the said projections` and the disk has a polygonal nut or projection, O, at its center for the attachment of a wrench for turning the disk, and a nut, P, tits upon the upper screwethreaded end of the central bolt and serves to clamp the cam'disk in its adjusted position. It will be seen that byturning the cam-disk so as to bring the ratchetteeth to bear against the projections upon the blocks the said blocks may be forced outward so as to bear against the tlange of the pack ing-disk and force the said flange against the side of the cylinder in which the piston iits and travels, and thus canse it to tit tighter, or by reversing the disk the packing may be loosened, causing the piston to travel more freely.

Having thus described my invention, I claim and desire to secure by Letters Patent oi' the United States-,-

The combination of a piston-body, a packing-disk having an overturned ange, ascrew threaded bolt axial tothe piston-body and projecting from its face, a disk having an annular recess at the edge of its face and having radiating grooves or recessesfi shaped blocks having arms sliding in the radiating recesses, and having segmental cross-hcads formed `with inwardly-facing shoulders having ratchet or wedge shaped projections, a disk turning upon the axial bolt having ratchet-teeth or cam projections corresponding in. number and location to the projections upon the blocks and having a central nut, and aclamping-nut fitting upon the threaded cent-ral bolt and bearing against the nut of the disk, as and for the purpose shown and set forth.

l In testimony that I claim the foregoing as my own I have hereunto affixed my signature in presence of two witnesses.

HIRAM L. BROWN. Vitnesses:

GHARLns H. Bitoois, PHILIP M. HENKEL. 

